Boiler-furnace.



J. P. WOLVIN.

BOILBR PURNACE.

APPLICATION FILED SEPT. 18, 1911. 1,063,489. Patented June 3, 1913.

2 SHEETS-SHEET 1.

vJ. P. WOLVIN.

BOILER FURNAGE. APPLICATION FILED SEPT. 18, 1911. y 1,063,489. Patented June 3, 1913.

2 SHEETS-SHEET 2.

- roiINv r. woLvrN, or s'r. CLAIR, MICHIGAN.

l -BoILE'n-Funnncn. A

Specification of Letters Patent Patented June 3, 1913.

1 Application filed september 1s, 1e11..`s'eria1 No. 649,924.

To all whom t may concern Be it known that I, JOHN F. -WoLv1N, a citizen of the United States. of America, residing atl St. Clair, in the county of St.

5 Clair and State of Michigan, have invented certain new and useful lmprovements .in

Boiler-Furnaces, of which the following is a specification, reference being had therein Y to the accompanying drawings.V

This invention relates to improvements in boiler furnaces and its object is to pro- Vide a 'construction especially adapted for burning crushed or powdered fuel, in which a very high degree of eiiiciency will be secured by the manner in which the fuel and air are introduced into the furnace and by the relative arrangement of the boiler and furnace parts, the invention'consisting in the matters hereinafter set forth and more particularly pointed outjn the claims, reference being hadl to the' accompanying drawings, in whichj Figure 1 is a lougitudinalvertical section throughl the rear portion of a furnace embodying the invention;- Fig. 2 is a similar view through the forward portion of said furnace, portions being broken 'away to shorten the figure; Fig. 3 is a transverse section of the same on-the line 3-3 of Fig. 1; Fig. 4.-, a similar section on the line 4.-4 of Fig. 1; Fig. 5, alike section on the line r5-'-5 of Fig. 2; Fig. 6, a section. 4on the line 6 6; Fig. 7, a section on the line7-7; and Fig. 8,-a front end elevation. 1

As shown in the drawings 1- is a suitable structure formedof brick work, 4in the forward end of which is an air chamber 2, access to which chamber may' be gained through asuitable door 3 in' the end wall. Mounted upon this forward end wall is a hopperlt to receive the fuel which is preferably powdered, crushed or otherwise previously prepared and a feed tube 5 extends through the wall across the upper part of the chamber 2 to conduct the fuel from the hopper.- A conveyer screw. 6 fitting within opening rearwardly of the furnace.-

Directly to the rear of the air chamber 2 is the tubular fire chamber 10 which opens throueh a vertical wall 11A into said air cham r 2 and is formed by a wall 12 which 1s circular in cross section and built up of 'fire brick or other suitable heat resisting material. Surrounding the wall 12 of the fire chamber is an annularr space or` air chamber 13 between saidV wall? 12 andthe outer circular wall 14 of the structurewhich air space communicates with the chamber 2 The funnel shaped feed pipe 9 is Supported with its longitudinal axis coinciding with the axis of the fire chamber and a steam pipe 15 opens into the forward end of the plpe 9 through a suitable restricted end or nozzle 16. The pipe 15 is bent within the chamber 2 and extended rearwardly through the wall 11 and air space 13 close to the wall 12 of the fire chamber. y

The rear end of the re chamber 10 opens through a series of holes 13 in said wall 11.

`into an expansion chamber 17 through-a vertical division wall andarranged at suit. able intervals across the re chamber near lts-rear end, are bailies 18 formed of checker ac ross the fire chamber intermediate its ends, sald baiies 19 being spaced a short distance apart and located at a considerable distance from the baffles 18. The openings in each ,of these bailes are out of alinement with .brick Work and similar baiiies 19 extend the openings in the adjacent baiiles so that mitted into the space around the re cham.

ber from al plurality of small tubular passages 22 formed in the outer (circular wall.

23 whichl forms a continuation of the wall 14 wand incloses a suitable tubular boiler 24C- having its iiues 25 extending longitudinally therethrough with their forward ends opening into the expansion chamber 17 L A battle wall 26 extends across thc expansion cham- -ber `17 at a short distance from the head of the boiler and this baiiie Walll is formed i mainly of Vchecker brick Work topermit the heated air vand products of combustion to pass therethrough into the boiler flues. The steam pipe'lextending rearwardly through the air space 13, passes through one of the holes 21 in the Wall 20 and thence `upward around the wall 12 of the fireV chamber at one side thereof to `one of the passages 22 The air passages 22 in the wall 23 surrounding the boiler, o en at their rear ends into an air chamber 2 in theforward end of an air heater 28, comprising an outer vcylindrical Acasing 29 having a forwardly flaring end 30 connected to the rear end of the wall 23 and forming the air chamber 27. This heater also comprises a front head or transverse wall 31 and a rear end wall 3,2 through which tubular air flues 32 open at their ends, said tubes extending horizontally through the casing` with ltheir rear ends open to the atmosphere and their forward ends opening into ,the chamber 27. Through the several air ues 32, extend tubes 33 of a lesser diameter than the internal diameter of the air flues to lea-ve a narrow passage between said tubes 33 and the walls of the air tubes. The forward ends of the tubes 33 open into a chamber 34 formed within the inclosing wall 23 at the rear end of the boiler by a transverse partition 35, and the rear ends of said tubes open through a header 36, into a bell Vshaped pipe 37 .which is connected at its contracted end to the intake opening in the casing 38 of any suitably constructed suction fan which is driven'by a pulley 39 or other suitable means upon its shaft.

In the operation of this furnace the suc-y tion created by the fan draws air through the tubes 33 from the chamber 34 and' through the boiler lues from the expansion chamber 17 and combustion chamber 10. This strong suction will draw in air through the opening 13 in the wall 11 from the `,space 13 surrounding the lire chamber and through the air passages 22 opening into the` rear end of said space, from the chamber 27 which is supplied by partially heated air entering through the tubes 32. The air to maintain combustion in the fire chamber which is drawn from the air space 13 is therefore heated to a high degree in passing through the heater and around the' fire chamber, thus aiding combustion. By taking steam from the steam dome and conducting the same through the passages and air space close to the heated walls, said steam is superheated before it enters the fire chamber and combustion is aided thereby. The force of the steam entering through the nozzle 16 will spread the powdered fuel as it is blown into the tire chamber and it wil1-at once be ignited and burned, the products of combustion passing rearwardly through the bailes 19 and 18 which serve to thoroughly mix the air and gases and retard their flow So thatpwhen they come in contact with the walls and baffles which are heated to a white heat, they will be ignited and burned. Upon entering the chamber 17, the air and gases expand and then come in contact with the baile 26 so that all combustible elements will be ignited and burned before reaching the boiler fines. By the time the products of combustion have reached the boiler they have been completely consumed and the air is heated to a very high degree which it imparts to the Water in the boiler in passing through the fines and in passing from the rear end of the boiler through the tubes 33, the heat is further extracted from the air by the wall of ingoing air surrounding each tube within the air tubes 32. Air at a comparatively low temperature is therefore sucked out by the suction fan, all combustible elements' of the fuel having been completely consumed and converted into heat units within the furnace.

' Having thus fully described my invention what I claim is l. In a furnace, the combination of a structure having an outer wall and an inner wall spaced from the outer wall and formed circular in cross sect-ion to form a longitudinally extending tubular fire chamber, said structure being also l formed with an air chamber at its forward end into which the forward end of the fire chamber and air space between said Walls open, and an expansion chamber at the rear end of the fire chamber which is of greater diameter t-han said fire chamber, baffles extending across the fire chamber near the rear end thereof, a tubular boiler inclosed within the structure in longitudinal axial alinement with the fire chamber, a suction device connected to the rear end of the structure to induce a flow of air through the fire chamber and expansion chamber and boiler, a fluid supply pipe Within the air chamber at the forward end of the structure opening rearwardly into the forward end of the fire chamber, and means for introducing fuel into the fluid entcri ng through said pipe.

2. In a furnace, the combination of a. structure having an outer wall and an inner wall with an air space between said walls, said inner wall being circular in cross section to form a longitudinally extending tubular fire chamber, said structure being alst` formed with an air chamber at. its forward end into which the forward end of the fire chamber and air space open, and a chamber of greater diameter thanthe diameter of the lire chamber into which the rear end of the fire chamber opens, said outer wall o1" an air space between said walls, said inner the structure surrounding the chamber at the rear of the fire chamber, being formed with air passages opening at their forward ends into the air space between the' outer wall and the wall of the fire chamber, a tubular boiler within the structure in lon gitudina-l axial alinement with the said chambers, an air heater at the rear of Lthe boiler comprising a series of air inlet tubes communicating at their forward ends with said air passages in the wall of the structure and a series of outlet tubes extending through the air tubes and communicating at their forward ends with a space into which the rear ends of the boiler fines open, a suction device connected to the rear ends of the outlet tubes, a steam pipe in the air chamber at the forward end of the structure opening rearwardly into the fire chamber and communicating at its opposite end with the boiler, and means for introducing fuel into the forward end of the fire chamber.

3. In a furnace, 4the .combination of a structure havin an outer wall and an inner wall which is circular in cross section with wall forming a longitudinally extending tire chamber, sald structure being formed with an air chamber at its forward end into which the forward end of `the ire chamber and air space open and formed with a chamber into which the rear end of the fire chamber opens forming an expansion chamber which is circular in cross section and which is surrounded by an extension of the outer wall of the structure which wall is formed with a series of air passages communicating at their forward ends with the air s ace' surrounding the fire chamber, a tub ar boiler surrounded by the extension of the outer wall of the structure formed with the air assages, an air heater at the rear of the iler having outlet tubes communicating at `said expansion chamber, a

their .forward ends with theboiler ues and A wall of the structure, a suction fan for drawing the air from the outlet tubes, a steam pipe in the air space surrounding the fire chamber and extending into the air chamber at the forward end of the structure with its rearwardly Haring end opening into the forward end of the fire chamber and communicating at its opposite end with the boiler, and means for feeding fuel into the steam entering throu h said pipe.

4. In a furnace, lt e combination of a structure having an outer wall,- an inner wall forming an' yair space between them and a longitudinal fire chamber, said structure being also formed with an air chamber at its forward end into which said fire chamber opens and with which said air space is in open communication and with an expansion chamber at the rear of 'and in axial alinement iwith said tire chamber, a tubular boiler within the structure in longitudinal alinement with the fire chamber with its tubes opening at their forward ends into luralit of spaced bailies extending across t e fire c amber near 'its rear end, a baille extending across the expansion chamber adjacent to the forward end of the boiler, a suction device for drawing air from the tire chamber through the expansion chamber and boiler iues, and means opening into the forward end of said fire chamber for blowing fuel into said chamber.

In testimony whereof I aix my signature lin presence of two witnesses.

' J OHN F. WOLVIN.

Witnesses:

A. M. SHANNON, ANNA C. Ravnain. 

